• ETRI Journal
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• v.33 no.1
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• pp.89-99
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• 2011

We construct surfaces with darts, creases, and corners by blending different types of local geometries. We also render these surfaces efficiently using programmable graphics hardware. Points on the blending surface are evaluated using simplified computation which can easily be performed on a graphics processing unit. Results show an eighteen-fold to twenty-fold increase in rendering speed over a CPU version. We also demonstrate how these surfaces can be trimmed using textures.

• Management Science and Financial Engineering
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• v.12 no.1
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• pp.95-112
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• 2006

Disassembly scheduling is the problem of determining the quantity and timing of disassembling used or end-of-life products while satisfying the demand of their parts and/or components over a planning horizon. The case of assembly product structure is considered while the resource capacity constraints are explicitly considered. A cost-based objective is considered that minimizes the sum of disassembly operation and inventory holding costs. The problem is formulated as an integer programming model, and a two-stage heuristic with construction and improvement algorithms is suggested in this paper. To test the performance of the heuristic, computational experiments are done on randomly generated problems, and the results show that the heuristic gives near optimal solutions within a very short amount of computation time.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.277-280
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• 2006

This paper presents the findings on the sulfate resistance of mortar specimens with or without alkali-free accelerator exposed to sodium sulfate solution for 270 days. Test results confirms a negative effect of alkali-free accelerator on the sulfate deterioration. Additionally, the influences of exposure concentration and temperature of sulfate solution on expansion were investigated. Especially, at a high concentration of solution a significant expansion of mortar specimens with alkali-free accelerator was observed. Further, low temperature also promoted the deterioration of the cement system due to sulfate attack.

• Journal of Electrical Engineering and Technology
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• v.10 no.3
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• pp.1007-1014
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• 2015

An optimally designed six-phase induction motor (6PIM) is compared with an initial design induction motor having the same ratings. The Genetic Algorithm (GA) method is used for optimization and multi objective function is considered. Comparison of the optimum design with the initial design reveals that better performance can be obtained by a simple optimization method. Also in this paper each design of 6PIM, is simulated by MAXWELL_2D. The obtained simulation results are compared in order to find the most suitable solution for the specified application, considering the influence of each design upon the motor performance. Construction a 6PIM based on the information obtained from GA method has been done. Quality parameters of the designed motors, such as: efficiency, power losses and power factor measured and optimal design has been evaluated. Laboratory tests have proven the correctness of optimal design.

• Journal of the Korean Society for Advanced Composite Structures
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• v.3 no.3
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• pp.31-37
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• 2012

Under the huge seismic loads, there are too many risks about which high-rise buildings lost their lateral stiffness caused by plasticity on frame members. Because of earthquake is important cause to bring the collapes countinue to human's life, many reports examined these phenomenons in various angles. And some of them reported the high possibility about building collapse by deformation concentrations under huge earthquakes. For preventing these phenomenons, researchers suggest some items-such as adding damping devices or strengthen their ductility or stifness. This report suggests choose the method of strengthen building stiffness and suggests the alternative designs using high strength steel-SM570TMC, and provides the results of time-history analysis about the alternative designs for investigation.

• Structural Engineering and Mechanics
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• v.54 no.5
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• pp.999-1016
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• 2015

In this paper, we introduce a new method for assembly of shipbuilding blocks at sea and present its feasibility focusing on structural safety. The core concept of this method is to assemble ship building blocks by use of bolting, gluing and welding techniques at sea without dock facilities. Due to its independence of dock facilities, shipyard construction capability could be increased considerably by the proposed method. To show the structural safety of this method, a bulk carrier and an oil tanker were employed, and we investigated the structural behavior of those ships to which the new block assembly method was applied. The ship hull models attached with connective parts are analyzed in detail through finite element analyses, and the cargo capacity of the bulk carrier is briefly discussed as well. The results of these studies show the potential for applying this new block assembly method to practical shipbuilding.

• 유체기계공업학회:학술대회논문집
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• 2003.12a
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• pp.649-655
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• 2003

Load calculation is indispensable for the construction of a large wind turbine generator system (WTGS). In procedures of load calculation, all conditions affecting to WTGS such as environment of site, operation, transport and installation have to be considered systematically. So the certification of WTGS is issued by assuring the load calculation. This work shows the generals of load calculation briefly and introduces the characteristics and results of load calculations for the 750 kW direct-drive WTGS (KBP-750D) which is under development by the consortium of POSTECH and UNISON.

• Journal of the Korean Vacuum Society
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• v.4 no.S2
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• pp.20-23
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• 1995

Shanghai Institute of Metallurgy(SIM), Chinese Academy of Sciences is a multioriented applied science reaearch institution that was founded in 1928. The current principal research activities of SIM cover three areas, namely, microelecronics, functional materials and devices, corrosion and protection of metals. The general information of SIM, includes history, personnel, organization, etc., is provided. The main research laboratories and R&D themes are introduced also. SIM has made great contributions to the economic construction and development of science and technoloty of the nation. China is facing a golden opportunity for development and SIM is playing an important role in translating research results into large-scale, commercial productions. Several successful examples are shown. SIM has been active in promoting international collaboration in research and development. The international cooperative projects in SIM are reviewed. SIM is facing the world, and going toward the 21st century.

• Journal of Korean Tunnelling and Underground Space Association
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• v.15 no.3
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• pp.215-223
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• 2013

An experimental research on the possibility of using fiber reinforced concrete precast tunnel segments instead of traditional reinforced concrete(RC) segment has been performed in europe. This solution allows removing the traditional reinforcement with several advantages in terms of quality and cost reduction. Full-scale bending tests were carried out in order to compare the behaviour of the segments under flexural actions on both rebar reinforced concrete and rebar-fiber reinforced elements. The test results showed that the fiber reinforced concrete can substitute the traditional reinforcement; in particular the segment performance is improved by the fiber presence, mainly in terms of crack.

• Journal of the Korean Professional Engineers Association
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• v.24 no.5
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• pp.129-137
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• 1991

In case a firm proceeds with TQC the activity of QCC, one of the activities concerned with TQC, is made first of all. There fore, in consideration that TQC could not be successful with the activity of QCC being unsuccessful a firm underlines activating QCC and makes considerable support of the educational discipline. However, as for the data of TQC having been introduced in domestic country no data related to construction industry have been found, all of them being concerned with manufacturing industry and it has happened that some firms of the construction industry make the negative reaction to the activity of QCC. So some of firms including our one have prepared and published their own texts and made them available by utilizing the translated Japanese data which were attained through Japanese construction firms. It is thought that a problem has been caused by the above-stated. While Japanese firms have made R & D of the features concerning to the most basic QCC activity for themselves, Korean ones have just followed and taken advantage of those originated by Japanese without being conscious of the basic idea, and this has caused the consequent failing of QCC activity. In other word, the emphasis of the results only rather than process has brought about the unsuccessful QCC activity.